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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305560c49ee3b1bb9ea5b7e57da64c7870481c9f4dfe5b0864d322eefbbbce96' 
  AND token = '/ZWwDhYs0fa5DrP2nZyNdDCP9zeH+iJzgBYBy8cFdK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}